Magnus does not understand how he got himself into this situation. He was just spending a quiet night at home with a martini in his hand when the motley crew showed up at his doorstep with the injured Luke. He needed a warlock. Against his better judgement he allowed them to come in. He could not turn away a person in desperate need. Bites from werewolf alphas are very painful and without his help it was likely that Luke would die. They are going to owe him big time.
So, now he is here waiting for the twolovebirdscome back with the ingredients he needs to finish the potion that is needed to heal the wounds. Magnus would never admit it but all of the magic that is needed to keep Luke stable is starting to take a toll on him. It doesn't take long before Luke is in so much pain and he has to take the werewolf pain away. He don't know how much longer he can do this. Even though he is the High Warlock of Brooklyn, his magic and body does have limits. Magnus told Jace that he needed Alec'sVirgin Shadowhunterenergy. That was partly true; he also just wanted to see Alec again. He hopes that he can make it in time.
His attention is brought back to Luke. The magic is wearing off. He has to do something. Magnus comes around to the side of couch and activates what magic he has left and uses it to keep the poison that is within Luke from spreading. The apartment begins to shake from the power of the magic that he is needing. He prays to the angels that the two will hurry with the ingredients. The poison is coming with a vengance. "I'm running out of magic." he hears himself say. He vaguely hears Clary what can she do. She needed to finish the potion when the Jace and Simon to back and feed it to Luke. Magnus senses Clary's worried look she casts towards him. He hears himself say, "I'll hold on as long as I can". Clary scurries away to do as she is told.
Magnus can feel himself getting weaker. He can feel his body getting heavy and at the brink of giving out. Time has run out. Lightheadedness take over his thoughts. The world begins to spin and he just hopes that he has done enough to keep Luke alive enough for the others to get back. He feels himself falling to the floor, eyes fluttering, before he feels a strong set of arms grab him from behind. A knee behind his back in an effort to keep him upright. Magnus opens his eyes to see a clearly worried Alec Lightwood supporting his exhausted body.
Alec's face was a picture of worry, looking for words to say but failing. Magnus weakly holds up a hand and says, "Help me. I need your strength". Alec looks at Magus and with a mere second of hesitation replies, "Take what you need." As soon as their hands meet Magnus could feel a rush of energy. It was different than any other thing that he had felt before. After a second for both of them to get use to the feeling Magnus nodded to Alec and he helps him sit up and start working on Luke again. Even with the new found strength Magnus could tell that he was loosing the battle with consciousness. He was one of the strongest warlock but his magic isn't endless. Beside him he could tell that Alec himself was starting to tire. Unsurprisingly he must not be used to giving his strength to someone, but he gave it willingly. He can't let himself take too much from Alec, make him weak and vulnerable.
Suddenly Magnus is shaken from his stupor by his front door slamming open and Jace and Simon coming into his apartment. Jace and Clary are talking but he can't understand them. He is completely focused on the venom in Lukes body. Clary comes around the other side of couch and pours the finished potion into Lukes mouth. Seconds later the room stops shaking and Luke wakes up. Magnus ceases his magic when he can tell that Luke has recovered. Still holding onto Alec's hand, the last thing he remembers is Clary smiling, Alec looking worriedly down at him and asking if he is okay. Magnus was too weak to respond and just goes limp in his arms as the world turns to black.